RxMarbles | RxMarbles iOS app - Interactive diagrams of Rx Observables | Reactive Programming library

I'm looking for an operator like Throttle, except the throttling behavior is only applied when a boolean value is true. So given two observables IObservable values and IObservable throttleCondition, I want to create an observable that does the following:

• All values from values are passed through, until
• when throttleCondition produces true. Then no values are passed through until,
• when throttleCondition produces false again. Then the last value of the sequence is propagated and any new values are passed through again.

Or, expressed in a marble diagram (notice the 4):

I have a simple setup to a problem but the solution seems to be more complicated.

Setup: I have a hot observable which originates from a scanner that will emit every number as a different element and an R when a code is complete.

Problem: From this I want a hot observable that emits every full code as 1 element.

I tried playing around with different flatMap, takeUntil and groupByoperators but haven't been able to come to a solution.

I have the following code

How can I create an RxJs observable that only emits a complete event and no next events?

I have an observable that performs some operations which has a side effect in which it populates an in-memory cache. I would like to use this observable as a semaphore so that a second observable only starts executing when it is complete. Then a second observable can use this cache to decorate incoming data. My idea is to use concat where the first observable only emits a complete event:

I'm using websocket to receive data frame from hardware. The data frame is defined like this:

0xbb(head) ---data--- 0xee(tail)

the received data is store in Uint8Array, there maybe multiple frame: